kcmd.c (getport): Clear the sin structure to be zero. (From Doug Engbert.)

kcmd.c (getport): Clear the sin structure to be zero.  (From Doug Engbert.)

krsh.c (main): Added code to default port to 544 if service not found.
	(From Doug Engbert.)

krlogin.c (main): Added code to default port to 543 or 2105 if service
	not found.  (From Doug Engbert.)

login.c (main): Save KRB5CCNAME environment variable, which may have
	been set by forward.c.  Add code for SGI to set environment for its
	/etc/TIMEZONE (untested).  Don't print MOTD twice on Suns, added
	#ifdef NO_MOTD.  (Patches from Doug Engbert).

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@7295 dc483132-0cff-0310-8789-dd5450dbe970